MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
*/*_In a centrifugal pump casing, the flow of water leaving the? |
| A. | Radial |
| B. | Axial |
| C. | Centrifugal |
| D. | Vortex |
| Answer» E. | |
| 452. |
*/*_The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is? |
| A. | 0.0116 stoke |
| B. | 0.116 stoke |
| C. | 0.0611 stoke |
| D. | 0.611 stoke |
| Answer» B. 0.116 stoke | |
| 453. |
*/*_A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will? |
| A. | Increase |
| B. | Decrease |
| C. | Remain same |
| D. | Increase/decrease depending on depth of immersion |
| Answer» D. Increase/decrease depending on depth of immersion | |
| 454. |
*/*_Air vessels in reciprocating pump are used to? |
| A. | Smoothen flow |
| B. | Reduce acceleration to minimum |
| C. | Increase pump efficiency |
| D. | Save pump from cavitations |
| Answer» C. Increase pump efficiency | |
| 455. |
*/*_According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to? |
| A. | The weight of the body |
| B. | More than the weight of the body |
| C. | Less than the weight of the body |
| D. | Weight of the fluid displaced by the body |
| Answer» E. | |
| 456. |
*/*_In a forced vortex, the velocity of flow everywhere within the fluid is? |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Nonzero finite |
| Answer» E. | |
| 457. |
*/*_Reynold's number is the ratio of the inertia force to the? |
| A. | Surface tension force |
| B. | Viscous force |
| C. | Gravity force |
| D. | Elastic force |
| Answer» C. Gravity force | |
| 458. |
*/*_The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.? |
| A. | One-half |
| B. | One-third |
| C. | Two-third |
| D. | None of these |
| Answer» C. Two-third | |
| 459. |
*/*_The atmospheric pressure with rise in altitude decreases? |
| A. | Linearly |
| B. | First slowly and then steeply |
| C. | First steeply and then gradually |
| D. | Unpredictable |
| Answer» C. First steeply and then gradually | |
| 460. |
*/*_The time oscillation of a floating body with increase in meatcentric height will be? |
| A. | Same |
| B. | Higher |
| C. | Lower |
| D. | Lower/higher depending on weight of body |
| Answer» D. Lower/higher depending on weight of body | |
| 461. |
*/*_When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called? |
| A. | Gauge pressure |
| B. | Absolute pressure |
| C. | Positive gauge pressure |
| D. | Vacuum pressure |
| Answer» D. Vacuum pressure | |
| 462. |
%_In a forced vortex, the velocity of flow everywhere within the fluid is_% |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Nonzero finite |
| Answer» E. | |
| 463. |
%_A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow._% |
| A. | Incompressible |
| B. | Compressible |
| C. | Viscous |
| D. | None of these |
| Answer» B. Compressible | |
| 464. |
%_When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is_% |
| A. | 1.84(L - 0.1nH)H3/2 |
| B. | 1.84(L - nH)H2 |
| C. | 1.84(L - 0.1nH)H5/2 |
| D. | 1.84(L - nH)H3 |
| Answer» B. 1.84(L - nH)H2 | |
| 465. |
%_A flow in which __________ force is dominating over the viscosity is called turbulent flow._% |
| A. | Elastic |
| B. | Surface tension |
| C. | Viscous |
| D. | Inertia |
| Answer» E. | |
| 466. |
%_The ratio of the inertia force to the __________ is called Euler's number._% |
| A. | Pressure force |
| B. | Elastic force |
| C. | Surface tension force |
| D. | Viscous force |
| Answer» B. Elastic force | |
| 467. |
%_Which of the following pump is suitable for small discharge and high heads?_% |
| A. | Centrifugal pump |
| B. | Axial flow pump |
| C. | Mixed flow pump |
| D. | Reciprocating pump |
| Answer» E. | |
| 468. |
%_Newton's law of viscosity is a relationship between_% |
| A. | Pressure, velocity and temperature |
| B. | Shear stress and rate of shear strain |
| C. | Shear stress and velocity |
| D. | Rate of shear strain and temperature |
| Answer» C. Shear stress and velocity | |
| 469. |
%_The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called_% |
| A. | Newton's law of motion |
| B. | Newton's law of cooling |
| C. | Newton's law of viscosity |
| D. | Newton's law of resistance |
| Answer» E. | |
| 470. |
%_The discharge through a reaction turbine with increase in unit speed_% |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 471. |
%_Choose the wrong statement. Alcohol is used in manometer, because_% |
| A. | Its vapour pressure is low |
| B. | It provides suitable meniscus for the inclined tube |
| C. | Its density is less |
| D. | It provides longer length for a given pressure difference |
| Answer» B. It provides suitable meniscus for the inclined tube | |
| 472. |
%_The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream_% |
| A. | Keeps on increasing |
| B. | Keeps on decreasing |
| C. | Remain constant |
| D. | May increase/decrease |
| Answer» D. May increase/decrease | |
| 473. |
%_The Francis formula for the discharge over Cipoletti weir is_% |
| A. | 1.84 LH1/2 |
| B. | 1.84 LH |
| C. | 1.84 LH3/2 |
| D. | 1.84 LH5/2 |
| Answer» D. 1.84 LH5/2 | |
| 474. |
%_The ratio of the inertia force to the elastic force is called_% |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Mach number |
| Answer» E. | |
| 475. |
%_The specific speed of a hydraulic turbine depends upon_% |
| A. | Speed and power developed |
| B. | Discharge and power developed |
| C. | Speed and head of water |
| D. | Speed, power developed and head of water |
| Answer» E. | |
| 476. |
_ A turbine develops 10000 kW under a head of 25 meters at 135 r.p.m. Its specific speed is$? |
| A. | 175.4 r.p.m. |
| B. | 215.5 r.p.m. |
| C. | 241.5 r.p.m. |
| D. | 275.4 r.p.m |
| Answer» D. 275.4 r.p.m | |
| 477. |
_ The absolute pressure is equal to$? |
| A. | Gauge pressure + atmospheric pressure |
| B. | Gauge pressure - atmospheric pressure |
| C. | Atmospheric pressure - gauge pressure |
| D. | Gauge pressure - vacuum pressure |
| Answer» B. Gauge pressure - atmospheric pressure | |
| 478. |
_ Dynamic viscosity of most of the gases with rise in temperature$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | Unpredictable |
| Answer» B. Decreases | |
| 479. |
_ In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)$? |
| A. | p/sinα |
| B. | 2p/sinα |
| C. | p/2sinα |
| D. | 2p/sin (α/2) |
| Answer» D. 2p/sin (≈í¬±/2) | |
| 480. |
_ Piezometer is used to measure$? |
| A. | Pressure in pipe, channels etc. |
| B. | Atmospheric pressure |
| C. | Very low pressures |
| D. | Difference of pressure between two points |
| Answer» D. Difference of pressure between two points | |
| 481. |
_ A differential manometer is used to measure$? |
| A. | Atmospheric pressure |
| B. | Pressure in pipes and channels |
| C. | Pressure in Venturimeter |
| D. | Difference of pressures between two points in a pipe |
| Answer» E. | |
| 482. |
_ According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies$? |
| A. | Directly as fan speed |
| B. | Square of fan speed |
| C. | Cube of fan speed |
| D. | Square root of fan speed |
| Answer» B. Square of fan speed | |
| 483. |
_ The force per unit length is the unit of$? |
| A. | Surface tension |
| B. | Compressibility |
| C. | Capillarity |
| D. | Viscosity |
| Answer» B. Compressibility | |
| 484. |
_ The meatcentric height is the distance between the$? |
| A. | Centre of gravity of the floating body and the centre of buoyancy |
| B. | Centre of gravity of the floating body and the metacentre |
| C. | Metacentre and centre of buoyancy |
| D. | Original centre of buoyancy and new centre of buoyancy |
| Answer» C. Metacentre and centre of buoyancy | |
| 485. |
_ The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as$? |
| A. | One dimensional flow |
| B. | Uniform flow |
| C. | Steady flow |
| D. | Turbulent flow |
| Answer» C. Steady flow | |
| 486. |
_ The center of pressure of a surface subjected to fluid pressure is the point$? |
| A. | On the surface at which resultant pressure acts |
| B. | On the surface at which gravitational force acts |
| C. | At which all hydraulic forces meet |
| D. | Similar to metacentre |
| Answer» B. On the surface at which gravitational force acts | |
| 487. |
_ In order to measure the flow with a Venturimeter, it is installed in$? |
| A. | Horizontal line |
| B. | Inclined line with flow upwards |
| C. | Inclined line with flow downwards |
| D. | Any direction and in any location |
| Answer» E. | |
| 488. |
_ Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of$? |
| A. | 39.2% |
| B. | 49.2% |
| C. | 68.8% |
| D. | 84.8% |
| Answer» B. 49.2% | |
| 489. |
_ The increase of temperature results in$? |
| A. | Increase in viscosity of gas |
| B. | Increase in viscosity of liquid |
| C. | Decrease in viscosity of gas |
| D. | Decrease in viscosity of liquid |
| Answer» E. | |
| 490. |
_ The flow in a pipe is turbulent when Reynold number is$? |
| A. | Less than 2000 |
| B. | Between 2000 and 2800 |
| C. | More than 2800 |
| D. | None of these |
| Answer» D. None of these | |
| 491. |
_ The bulk modulus of elasticity with increase in pressure$? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Increases first up to certain limit and then decreases |
| Answer» B. Decreases | |
| 492. |
_ The flow ratio in case of Francis turbine varies from$? |
| A. | 0.15 to 0.3 |
| B. | 0.4 to 0.5 |
| C. | 0.6 to 0.9 |
| D. | 1 to 1.5 |
| Answer» B. 0.4 to 0.5 | |
| 493. |
_ The undershot water wheels are those in which$? |
| A. | The wheel runs entirely by the weight of water |
| B. | The wheel runs entirely by the impulse of water |
| C. | The wheel runs partly by the weight of water and partly by the impulse of water |
| D. | None of the above |
| Answer» C. The wheel runs partly by the weight of water and partly by the impulse of water | |
| 494. |
_ The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as$? |
| A. | Normal speed |
| B. | Unit speed |
| C. | Specific speed |
| D. | None of these |
| Answer» D. None of these | |
| 495. |
_ The viscosity of a liquid __________ its rate of flow through a hole in a vessel.$? |
| A. | Effects |
| B. | Does not effect |
| C. | Both A and B |
| D. | None of these |
| Answer» B. Does not effect | |
| 496. |
_ The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)$? |
| A. | (8/15) Cd. 2g. H |
| B. | (8/15) Cd. 2g. H3/2 |
| C. | (8/15) Cd. 2g. H² |
| D. | (8/15) Cd. 2g. H5/2 |
| Answer» E. | |
| 497. |
_ The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.$? |
| A. | Decreases |
| B. | Increases |
| C. | Remain same |
| D. | None of these |
| Answer» C. Remain same | |
| 498. |
_ A flow is called sub-sonic, if the Mach number is$? |
| A. | Less than unity |
| B. | Unity |
| C. | Between 1 and 6 |
| D. | More than 6 |
| Answer» B. Unity | |
| 499. |
_ The impeller of a centrifugal pump may have$? |
| A. | Volute casing |
| B. | Volute casing with guide blades |
| C. | Vortex casing |
| D. | Any one of these |
| Answer» E. | |
| 500. |
_ The unit discharge through the turbine is$? |
| A. | Q/‚à öH |
| B. | Q/H |
| C. | Q/H3/2 |
| D. | Q/H² |
| Answer» B. Q/H | |